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It's interesting that Yahoo and Google AdWords report pretty much the same numbers for traffic (click-thrus). But when it comes to conversions, Google consistently reports numbers that are double what Yahoo is telling us.
I've contacted Google AdWords, and they asked me to send them more info so they could "check into it."
We sell a lot of shareware with a 2 week trial and often see the reported sales at the end of the month at least double because of this effect.
Then again I do not know how and where you guys measure in the process so this is just some educated guessing....
So, I asked one of them to take a look at this thread, and see if he could offer any insight - and have what I hope will be some useful info.
...we may report duplicate transactions if for any reason people are refreshing or reloading the conversion page.
...most likely, if it's almost exactly double, then the page is either prompting users to refresh/reload, or the site has a print button that is not properly designed and does a page refresh when printing.
Hope this'll give you a place to start looking, dbriggs. And welcome to WebmasterWorld!
I suppose this conversation might be better suited to a forum about Yahoo stores, as it seems this is where I need to do some more investigation. But for those of you who are interested, here's how I use the Yahoo store affiliate program to measure both traffic and conversions from my Google ads.
Yahoo store has a fairly typical affiliate system--I create unique codes to give to my affiliates to place in their website links to me. When visitors come to me via those links, Yahoo store reports traffic from that unique code and also lets me know how many of these visitors place an order and how much they spend. I assume Yahoo gets this info by simply tracking the code to the confirmation page, which indicates a purchase has been made (all products in my store are downloadable--the credit card transaction is complete at time of purchase).
So I created an affiliate code that I give to Google for the URL in my ads. When visitors come in from my Google ads, Yahoo reports the traffic, number of orders, and total sales attributed to that code. Yahoo's affiliate code reporting appears to be updated daily. I can look at stats over an entire year or just look at what came in from my Google Adwords yesterday. I guess I don't have any reason to believe the Yahoo numbers are skewed, it seems to be a pretty straight-forward affiliate code tracking process.
It seems to work, but like I've said, the conversions that Google AdWords reports to me are always about double the conversions that Yahoo store shows from the same ad. I'm hoping to hear from Google soon with more details about what might be causing the problem.